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Forward-Secure Searchable Encryption on Labeled Bipartite Graphs

  • Russell W. F. LaiEmail author
  • Sherman S. M. Chow
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10355)

Abstract

Forward privacy is a trending security notion of dynamic searchable symmetric encryption (DSSE). It guarantees the privacy of newly added data against the server who has knowledge of previous queries. The notion was very recently formalized by Bost (CCS ’16) independently, yet the definition given is imprecise to capture how forward secure a scheme is. We further the study of forward privacy by proposing a generalized definition parametrized by a set of updates and restrictions on them. We then construct two forward private DSSE schemes over labeled bipartite graphs, as a generalization of those supporting keyword search over text files. The first is a generic construction from any DSSE, and the other is a concrete construction from scratch. For the latter, we designed a novel data structure called cascaded triangles, in which traversals can be performed in parallel while updates only affect the local regions around the updated nodes. Besides neighbor queries, our schemes support flexible edge additions and intelligent node deletions: The server can delete all edges connected to a given node, without having the client specify all the edges.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Department of Information EngineeringThe Chinese University of Hong KongShatin, N.T.Hong Kong

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